Bromley takes the sustainable road with use of warm mix asphalt

Warm mix asphalt is now being used on roads in the borough of Bromley, meaning new surfaces can be laid faster with the asphalt setting quicker as well as being more sustainable than more traditional ones.

Working with its highways maintenance partner, Riney, Bromley Council has committed to using warm mix asphalt for road maintenance moving forward, a solution that involves laying asphalt at lower temperatures than traditional mixes.

The material is supplied through Riney by its parent company, Tarmac, and is quick and easy to lay, requiring less cooling time between courses and so increasing the amount of material that can be laid in a standard shift.

It is estimated that this method of road building and repair could save 60,000 tonnes of CO2 per year nationally, the equivalent of 300 million miles of car journeys* and offers significant public health benefits in terms of clean air.

Despite these benefits, a report from the All Party Parliamentary Group (APPG) for Highways states that the widespread adoption of warm mix asphalt has so far failed to take place. The report states that adoption in the UK currently stands at less than 4%, behind the US on 40% and France at 15%.

Councillor William Huntington-Thresher, Executive Councillor for Environment and Community Services said, “Bromley is the clean, green and safe borough, we are pleased to be one of the first boroughs to adopt this more sustainable and efficient way of working. It supports our environmental commitments including achieving carbon neutrality for council activities by 2029.  This is another example of Bromley working with our partners and contractors for our residents benefit providing them with a great place to live now and for future generations.” 

Councillor Huntington-Thresher continued, “There is no cost difference to us but with less energy intensive methods repairs completed quicker and with less impact on the environment, this is the right thing to do.  In the coming months, we are committed to spending in excess of £1million as part of our existing work programme and I am pleased to be showcasing this new way of working.  This is another example of where doing the right thing from an environmental perspective actually delivers other benefits too, which in this case, ultimately means that our road works will be completed quicker, enabling all road users, including cyclists and pedestrians to get back to their normal journeys quicker to get back to their normal journeys quicker, with potential reduction in congestion and the like. Bromley is pleased to be working with Riney adopting innovative technologies to lead the way in London.”

Brian Kent, national technical director at Tarmac, said: “An increasing number of local authorities are taking action to adopt more sustainable ways of working and it’s great to see Bromley leading the way in the capital with a commitment to use the material across its network. 

“Warm mix asphalt is a proven materials technology that benefits road users, residents living around areas of roadworks, highways workforces who spend less time exposed to traffic during roadworks, and the environment.”


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